use std::str::FromStr;

use crate::{
    Request,
    commands::{
        Command, RequestParserError, RequestParserResult, ResponseAttributes, ResponseParserError,
    },
    common::OneOrRange,
};

pub struct Delete;

impl Command for Delete {
    type Request = OneOrRange;
    type Response = ();
    const COMMAND: &'static str = "delete";

    fn serialize_request(&self, request: Self::Request) -> String {
        format!("{} {}", Self::COMMAND, request)
    }

    fn parse_request(mut parts: std::str::SplitWhitespace<'_>) -> RequestParserResult<'_> {
        let pos_or_range = parts.next().ok_or(RequestParserError::UnexpectedEOF)?;
        let one_or_range = OneOrRange::from_str(pos_or_range)
            .map_err(|_| RequestParserError::SyntaxError(0, pos_or_range.to_string()))?;

        debug_assert!(parts.next().is_none());

        Ok((Request::Delete(one_or_range), ""))
    }

    fn parse_response(
        parts: ResponseAttributes<'_>,
    ) -> Result<Self::Response, ResponseParserError<'_>> {
        debug_assert!(parts.is_empty());
        Ok(())
    }
}